Hi -
Considering that it seems the problem is confined to the left cylinder head, And the fix includes a replacement of this head, and as insurance, the lifters, and rocker arms. Those on here that have had this replacement conclude that it fixes the tapping/ticking issues.

So, those of you that have this problem, what is your build date? I think that we need to pinpoint this out as well.

Please if you do not have a problem with your truck, DO NOT post your build date, only those who are having issues should.